diff --git a/janis_core/ingestion/fromwdl.py b/janis_core/ingestion/fromwdl.py
index 502de88a2..80c466497 100755
--- a/janis_core/ingestion/fromwdl.py
+++ b/janis_core/ingestion/fromwdl.py
@@ -177,13 +177,15 @@ def container_from_runtime(cls, runtime, inputs: List[WDL.Decl]):
 
     def parse_memory_requirement(self, value):
         s = self.translate_expr(value)
-        if isinstance(s, str):
+        if s is None:
+            return 1.074
+        elif isinstance(s, str):
             if s.lower().endswith("g"):
                 return float(s[:-1].strip())
             if s.lower().endswith("gb"):
                 return float(s[:-2].strip())
             elif s.lower().endswith("gib"):
-                return float(s[:-3].strip()) * 0.931323
+                return float(s[:-3].strip()) * 1.074
             elif s.lower().endswith("mb"):
                 return float(s[:-2].strip()) / 1000
             elif s.lower().endswith("mib"):
@@ -235,7 +237,7 @@ def from_loaded_task(self, obj: WDL.Task):
         inputs = obj.inputs
 
         cpus = self.translate_expr(rt.get("cpu"))
-        if cpus is not None and not isinstance(cpus, (int, float)):
+        if not isinstance(cpus, j.Selector) and cpus is not None and not isinstance(cpus, (int, float)):
             cpus = int(cpus)
 
         c = j.CommandToolBuilder(
diff --git a/janis_core/tests/test_from_wdl.py b/janis_core/tests/test_from_wdl.py
index c7af8d607..4340aa386 100644
--- a/janis_core/tests/test_from_wdl.py
+++ b/janis_core/tests/test_from_wdl.py
@@ -8,4 +8,4 @@ class TestFromWdl(unittest.TestCase):
 
     def test_missing_disk(self):
         result = self.parser.parse_disk_requirement(None)
-        self.assertEqual(0.931323, result)
+        self.assertEqual(2.14748, result)
diff --git a/requirements/base.txt b/requirements/base.txt
index fd20d2b7a..c9c84cf1a 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -6,4 +6,5 @@ tabulate
 path
 cwlformat >= 2020.5.19
 cwl-utils >= 0.6
-graphviz
\ No newline at end of file
+graphviz
+miniwdl
\ No newline at end of file